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3 years ago

Please i really need to get this done today..

2 answers:

7 0

Producers generate food for primary consumers. They are the basis of the food web because without them, there would be no food web.

Eduardwww [97]3 years ago

6 0

Producers are plants, they really are the base of all food webs. This is because with out them everything would just fall apart. When you think of a food web you might think about Bunny>Snake>Hawk but the base of that food web is the plants that the Bunny eats. Without the plants everything else in the food web would starve.

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A train is speeding down a railroad track at the speed of 50 miles per hour. From whose reference point is the train not moving?

marysya [2.9K]

A: a person sitting on a train

Hence person could have a meal and not get food all over them.

3 0

4 years ago

If a spear is jabbeb exactly at that place where the fish appears in water, the fish is not killed

Korvikt [17]

You have learned your lesson well, Suhay. Your statement is correct.

The light rays from the fish BEND when they flow out of the water into the air. But our primitive brain still believes that the light rays flow STRAIGHT from the fish. The result is that the fish does not APPEAR to be at that place where it really is.

7 0

3 years ago

It takes 56.5 kilojoules of energy to raise the temperature of 150 milliliters of water from 5°C to 95°C. If you

Debora [2.8K]

You'd get an extra 40/60 of the energy, or 2/3. Multiply 5/3 by the required energy to get the actual consumption.

7 0

3 years ago

A rope of negligible mass is wrapped around a 225-kg solid cylinder of radius 0.400 m. The cylinder is suspended several meters

vodomira [7]

Answer:

a)6.67 m/s2

b)16.7 rad/s2

c)increasing angular acceleration

Explanation:

a) It's because the system is not just mass of the man, it consists of the man holding a rope wrapped around a cylinder, not just a man free falling. So you would have to consider the rotating cylinder under the torque created by the man gravity force.

Let g = 10m/s2

T = mgd =75*10*0.4 = 300 N.m

The from the mass moments inertial of the solid cylinder:

$I = \frac{Mr^2}{2} = \frac{225*0.4^2}{2} = 18 kgm^2$

we can calculate the angular acceleration of the cylinder:

$\alpha = \frac{T}{I} = \frac{300}{18} = 16.7 rad/s^2$

then translate that to acceleration:

$a = \alpha * r = 16.7*0.4 = 6.67 m/s^2$

c) if the mass of the rope is not neglected, that means the force of gravity increases as the rope unwrapping around the cylinder, so the torque increases. Also the moment of inertial of the rope-cylinder system decreases due to rope unwrapping. In the end, the angular acceleration is no longer constant, but increasing.

4 0

4 years ago

A 3000 kg freight train traveling at a rate of 2 m/s strikes a stationery 3000 kg freight car and couples up. What is the speed

Contact [7]

Answer:

1 m/s

Explanation:

Momentum before the collision = momentum after the collision

m₁ u₁ + m₂ u₂ = m₁ v₁ + m₂ v₂

(3000 kg) (2 m/s) + (3000 kg) (0 m/s) = (3000 kg) v + (3000 kg) v

6000 kgm/s = 6000 kg v

v = 1 m/s

5 0

4 years ago